It is a 'G' type plug used in various countries including China, the Middle East and a number of South American countries.

A G plug has one of the pins at right angles to the other two. The odd plug pictured has the pins arrayed in the same (horizontal) plane.

If the machine were mine I'd remove the plug housing, checking wire connections carefully, and replace the whole thing with a standard plug for your country. An electrician could do the job in 5 minutes if you had the required replacement part available.